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QQ
3 7 63 1515 0
DECK SECTION
1. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head demagnetizer close to the erase
head.)
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjust.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in
this service manual. (As a general rule, playback circuit ad-
justment should be completed before performing recording
circuit adjustment.)
6. The adjustments should be performed for both L-CH and R-
ch.
7. Switches and controls should be set as follows unless other-
wise specified.
8. Set to test mode. (Press key switch same time
FUNCTION ENTER and PROGRAM button.)
•
Test Tape
Tape
P-4-A100
WS-48B
P-4-L300
Record/Playback Head Azimuth Adjustment
TE
DECK A
DECK B
L 13942296513
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback (FWD)
test tape
P-4-A100
(10KHz, –10dB)
www
.
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ELECTRICAL ADJUSTMENTS
0dB=0.775V
Signal
Used for
10kHz, –10 dB
Azimuth Adjustment
3kHz, 0dB
Tape Speed Adjustment
315Hz 0dB
Level Adjustment
main board
CN207
Pin 1 (L-CH)
Pin 3 (R-CH)
level meter
set
main board
CN207
Pin 2
x
ao
y
i
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SECTION 5
8
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
L-CH
peak
Screw
position
3. Mode: Playback (FWD)
test tape
P-4-A100
(10kHz, –10dB)
Q Q
3
6 7
1 3
4. Repeat steps 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Record/Playback Head (Deck A and B)
+
–
u163
.
– 39 –
2 9
9 4
2 8
within
1dB
output
level
R-CH
peak
L-CH
R-CH
peak
peak
oscilloscope
pin 1
L-CH
pin 2
main
L
board
CN207
R
set
R-CH
pin 3
waveform of oscilloscope
1 5
0 5
8
2 9
9 4
in phase 45 °
90 ° 135 ° 180 °
good
wrong
and MAIN board.
forward
m
co
9 9
within
1dB
Screw
position
V
H
2 8
9 9
reverse
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